Telling Friends Where You Are (or Not) (Published 2010)

Austin residents Jordan Viator and David Neff check on their Foursquare updates while visiting a local bar in Austin, Tex., during the South by Southwest convention.Credit...Bryce Harper for The New York Times AUSTIN, Tex. — As Jordan Viator roams the conference rooms, dimly lit bars and restaurants here at the South by Southwest Interactive conference, she often pulls out her cellphone and uses t

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